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333 lines
10 KiB
EmacsLisp
333 lines
10 KiB
EmacsLisp
;;; mml1991.el --- Old PGP message format (RFC 1991) support for MML -*- lexical-binding: t; -*-
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;; Copyright (C) 1998-2024 Free Software Foundation, Inc.
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;; Author: Sascha Lüdecke <sascha@meta-x.de>,
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;; Simon Josefsson <simon@josefsson.org> (Mailcrypt interface, Gnus glue)
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;; Keywords: PGP
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(eval-when-compile (require 'mm-util))
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(require 'mm-encode)
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(require 'mml-sec)
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(defvar mc-pgp-always-sign)
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(autoload 'quoted-printable-decode-region "qp")
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(autoload 'quoted-printable-encode-region "qp")
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(autoload 'mm-decode-content-transfer-encoding "mm-bodies")
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(autoload 'mm-encode-content-transfer-encoding "mm-bodies")
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(autoload 'message-options-get "message")
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(autoload 'message-options-set "message")
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(require 'mml2015)
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(defvar mml1991-use mml2015-use
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"The package used for PGP.")
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(defvar mml1991-function-alist
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'((mailcrypt mml1991-mailcrypt-sign
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mml1991-mailcrypt-encrypt)
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(pgg mml1991-pgg-sign
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mml1991-pgg-encrypt)
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(epg mml1991-epg-sign
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mml1991-epg-encrypt))
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"Alist of PGP functions.")
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(defvar mml1991-cache-passphrase mml-secure-cache-passphrase
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"If t, cache passphrase.")
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(make-obsolete-variable 'mml1991-cache-passphrase
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'mml-secure-cache-passphrase
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"25.1")
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(defvar mml1991-passphrase-cache-expiry mml-secure-passphrase-cache-expiry
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"How many seconds the passphrase is cached.
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Whether the passphrase is cached at all is controlled by
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`mml1991-cache-passphrase'.")
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(make-obsolete-variable 'mml1991-passphrase-cache-expiry
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'mml-secure-passphrase-cache-expiry
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"25.1")
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(defvar mml1991-signers nil
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"A list of your own key ID which will be used to sign a message.")
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(defvar mml1991-encrypt-to-self nil
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"If t, add your own key ID to recipient list when encryption.")
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;;; mailcrypt wrapper
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(autoload 'mc-sign-generic "mc-toplev")
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(defvar mml1991-decrypt-function 'mailcrypt-decrypt)
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(defvar mml1991-verify-function 'mailcrypt-verify)
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(defun mml1991-mailcrypt-sign (_cont)
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(let ((text (current-buffer))
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headers signature
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(result-buffer (get-buffer-create "*GPG Result*")))
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;; Save MIME Content[^ ]+: headers from signing
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(goto-char (point-min))
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(while (looking-at "^Content[^ ]+:") (forward-line))
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(unless (bobp)
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(setq headers (buffer-string))
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(delete-region (point-min) (point)))
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(goto-char (point-max))
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(unless (bolp)
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(insert "\n"))
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(quoted-printable-decode-region (point-min) (point-max))
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(with-temp-buffer
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(setq signature (current-buffer))
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(insert-buffer-substring text)
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(unless (mc-sign-generic (message-options-get 'message-sender)
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nil nil nil nil)
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(unless (> (point-max) (point-min))
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(pop-to-buffer result-buffer)
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(error "Sign error")))
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(goto-char (point-min))
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(while (re-search-forward "\r+$" nil t)
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(replace-match "" t t))
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(quoted-printable-encode-region (point-min) (point-max))
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(set-buffer text)
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(delete-region (point-min) (point-max))
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(if headers (insert headers))
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(insert "\n")
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(insert-buffer-substring signature)
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(goto-char (point-max)))))
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(declare-function mc-encrypt-generic "ext:mc-toplev"
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(&optional recipients scheme start end from sign))
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(defun mml1991-mailcrypt-encrypt (_cont &optional sign)
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(let ((text (current-buffer))
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(mc-pgp-always-sign
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(or mc-pgp-always-sign
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sign
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(eq t (or (message-options-get 'message-sign-encrypt)
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(message-options-set
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'message-sign-encrypt
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(or (y-or-n-p "Sign the message? ")
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'not))))
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'never))
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cipher
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(result-buffer (get-buffer-create "*GPG Result*")))
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;; Strip MIME Content[^ ]: headers since it will be ASCII ARMORED
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(goto-char (point-min))
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(while (looking-at "^Content[^ ]+:") (forward-line))
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(unless (bobp)
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(delete-region (point-min) (point)))
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(with-temp-buffer
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(inline (mm-disable-multibyte))
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(setq cipher (current-buffer))
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(insert-buffer-substring text)
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(unless (mc-encrypt-generic
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(or
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(message-options-get 'message-recipients)
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(message-options-set 'message-recipients
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(read-string "Recipients: ")))
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nil
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(point-min) (point-max)
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(message-options-get 'message-sender)
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'sign)
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(unless (> (point-max) (point-min))
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(pop-to-buffer result-buffer)
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(error "Encrypt error")))
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(goto-char (point-min))
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(while (re-search-forward "\r+$" nil t)
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(replace-match "" t t))
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(set-buffer text)
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(delete-region (point-min) (point-max))
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;;(insert "Content-Type: application/pgp-encrypted\n\n")
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;;(insert "Version: 1\n\n")
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(insert "\n")
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(insert-buffer-substring cipher)
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(goto-char (point-max)))))
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;; pgg wrapper
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(autoload 'pgg-sign-region "pgg")
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(autoload 'pgg-encrypt-region "pgg")
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(defvar pgg-default-user-id)
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(defvar pgg-errors-buffer)
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(defvar pgg-output-buffer)
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(defvar pgg-text-mode)
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(defun mml1991-pgg-sign (_cont)
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(let ((pgg-text-mode t)
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(pgg-default-user-id (or (message-options-get 'mml-sender)
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pgg-default-user-id))
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headers cte)
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;; Don't sign headers.
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(goto-char (point-min))
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(when (re-search-forward "^$" nil t)
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(setq headers (buffer-substring (point-min) (point)))
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(save-restriction
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(narrow-to-region (point-min) (point))
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(setq cte (mail-fetch-field "content-transfer-encoding")))
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(forward-line 1)
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(delete-region (point-min) (point))
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(when cte
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(setq cte (intern (downcase cte)))
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(mm-decode-content-transfer-encoding cte)))
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(unless (pgg-sign-region (point-min) (point-max) t)
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(pop-to-buffer pgg-errors-buffer)
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(error "Encrypt error"))
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(delete-region (point-min) (point-max))
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(insert
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(with-temp-buffer
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(set-buffer-multibyte nil)
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(insert-buffer-substring pgg-output-buffer)
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(goto-char (point-min))
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(while (re-search-forward "\r+$" nil t)
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(replace-match "" t t))
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(when cte
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(mm-encode-content-transfer-encoding cte))
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(goto-char (point-min))
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(when headers
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(insert headers))
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(insert "\n")
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(buffer-string)))
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t))
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(defun mml1991-pgg-encrypt (_cont &optional sign)
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(goto-char (point-min))
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(when (re-search-forward "^$" nil t)
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(let ((cte (save-restriction
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(narrow-to-region (point-min) (point))
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(mail-fetch-field "content-transfer-encoding"))))
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;; Strip MIME headers since it will be ASCII armored.
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(forward-line 1)
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(delete-region (point-min) (point))
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(when cte
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(mm-decode-content-transfer-encoding (intern (downcase cte))))))
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(unless (let ((pgg-text-mode t))
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(pgg-encrypt-region
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(point-min) (point-max)
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(split-string
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(or
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(message-options-get 'message-recipients)
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(message-options-set 'message-recipients
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(read-string "Recipients: ")))
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"[ \f\t\n\r\v,]+")
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sign))
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(pop-to-buffer pgg-errors-buffer)
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(error "Encrypt error"))
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(delete-region (point-min) (point-max))
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(insert "\n")
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(insert-buffer-substring pgg-output-buffer)
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t)
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;; epg wrapper
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(defvar epg-user-id-alist)
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(autoload 'epg-make-context "epg")
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(autoload 'epa-select-keys "epa")
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(autoload 'epg-list-keys "epg")
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(autoload 'epg-context-set-armor "epg")
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(autoload 'epg-context-set-textmode "epg")
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(autoload 'epg-context-set-signers "epg")
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(autoload 'epg-context-set-passphrase-callback "epg")
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(autoload 'epg-key-sub-key-list "epg")
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(autoload 'epg-sub-key-capability "epg")
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(autoload 'epg-sub-key-validity "epg")
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(autoload 'epg-sub-key-fingerprint "epg")
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(autoload 'epg-sign-string "epg")
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(autoload 'epg-encrypt-string "epg")
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(autoload 'epg-configuration "epg-config")
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(autoload 'epg-expand-group "epg-config")
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(defun mml1991-epg-sign (_cont)
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(let (headers cte)
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;; Don't sign headers.
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(goto-char (point-min))
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(when (re-search-forward "^$" nil t)
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(setq headers (buffer-substring (point-min) (point)))
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(save-restriction
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(narrow-to-region (point-min) (point))
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(setq cte (mail-fetch-field "content-transfer-encoding")))
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(forward-line 1)
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(delete-region (point-min) (point))
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(when cte
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(setq cte (intern (downcase cte)))
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(mm-decode-content-transfer-encoding cte)))
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(let* ((pair (mml-secure-epg-sign 'OpenPGP 'clear))
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(signature (car pair)))
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(unless (stringp signature)
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(error "Signature failed"))
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(delete-region (point-min) (point-max))
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(insert
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(with-temp-buffer
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(set-buffer-multibyte nil)
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(insert signature)
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(goto-char (point-min))
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(while (re-search-forward "\r+$" nil t)
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(replace-match "" t t))
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(when cte
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(mm-encode-content-transfer-encoding cte))
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(goto-char (point-min))
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(when headers
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(insert headers))
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(insert "\n")
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(buffer-string)))
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t)))
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(defun mml1991-epg-encrypt (cont &optional sign)
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(goto-char (point-min))
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(when (re-search-forward "^$" nil t)
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(let ((cte (save-restriction
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(narrow-to-region (point-min) (point))
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(mail-fetch-field "content-transfer-encoding"))))
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;; Strip MIME headers since it will be ASCII armored.
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(forward-line 1)
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(delete-region (point-min) (point))
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(when cte
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(mm-decode-content-transfer-encoding (intern (downcase cte))))))
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(let ((cipher (mml-secure-epg-encrypt 'OpenPGP cont sign)))
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(delete-region (point-min) (point-max))
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(insert "\n" cipher))
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t)
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;;;###autoload
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(defun mml1991-encrypt (cont &optional sign)
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(let ((func (nth 2 (assq mml1991-use mml1991-function-alist))))
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(if func
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(funcall func cont sign)
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(error "Cannot find encrypt function"))))
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;;;###autoload
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(defun mml1991-sign (cont)
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(let ((func (nth 1 (assq mml1991-use mml1991-function-alist))))
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(if func
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(funcall func cont)
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(error "Cannot find sign function"))))
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(provide 'mml1991)
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;; Local Variables:
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;; coding: utf-8
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;; End:
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;;; mml1991.el ends here
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